Method of manufacturing plastic molding
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United States of America Patent
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Jan 19, 1988
Grant Date -
N/A
app pub date -
Sep 3, 1985
filing date -
Jan 22, 1985
priority date (Note) -
Expired
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Abstract
A method of manufacturing a plastic molding of a foamable thermoplastic raw material blank or preform which contains a foaming agent by high frequency voltage heating in a molding die assembly defining a molding cavity, wherein gas discharging openings which extend through the thickness of the blank or preform are preformed in the raw material blank or preform.
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